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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2012-03-21 16:33:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-21 17:54:56 -0700 |
| commit | 4bfc130d5afa28395288d1b57092906349604b41 (patch) | |
| tree | 947666e26c6f1e55b3ebdf5edcefda5019a65c8f /fs/hugetlbfs | |
| parent | aad6ec3777bf4930d4f7293745cc4c17a2d87947 (diff) | |
| download | linux-4bfc130d5afa28395288d1b57092906349604b41.tar.gz | |
hugetlbfs: fix hugetlb_get_unmapped_area()
Use/update cached_hole_size and free_area_cache properly to speedup finding of a free region. Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Hillf Danton <dhillf@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hugetlbfs')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 1e85a7ac0217..b7bc7868c7b5 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -154,10 +154,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, return addr; } - start_addr = mm->free_area_cache; - - if (len <= mm->cached_hole_size) + if (len > mm->cached_hole_size) + start_addr = mm->free_area_cache; + else { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + } full_search: addr = ALIGN(start_addr, huge_page_size(h)); @@ -171,13 +173,18 @@ full_search: */ if (start_addr != TASK_UNMAPPED_BASE) { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; goto full_search; } return -ENOMEM; } - if (!vma || addr + len <= vma->vm_start) + if (!vma || addr + len <= vma->vm_start) { + mm->free_area_cache = addr + len; return addr; + } + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; addr = ALIGN(vma->vm_end, huge_page_size(h)); } } |